Double evaporator and process of treating petroleum-oils.



l NI. LTRUMBLE.

DOUBLE EvAPoRAmR ANDPRQcEss oF TREATING PETROLEUM ons.

Y APPLICTIQN FILED DEC.5, I|914. 'I Ljg., Patented Dec.l1,1917f.-

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M11. THUMBLE. DOUBLE EVAPORATOR AND. PROCESS v0F TREATING PETROLEUM OILS.

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MILON J. TRUMBLE, 0F LOS ANGELES, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO SIMPLEX BEFINING COMPANY, A CORPORATION 0F CALIFORNIA.

DOUBLE EVAPORATOR AND PROCESS OF TREATING PETROLEUM-OILS.

Application led December 5, 1914. Serial No. 875,737.

To all whom z't may concern:

Be it known that I, MILoN J. TRUMBLE, a citizen of the United States, residing at Los Angeles in the county of Los ngeles, State of California, have invented a new and useful Double Evaporator and Processes of Treating Petroleum-Oils, of which the following is a specification.

My invention relates to the art of refining oils, and particularly to the art of refining crude petroleum.

In Letters Patent No. 996,736, for evaporator for petroleum oils and other liquids, granted to me on July 4, 1911, I have disclosed an apparatus for evaporating oils which is commonly called. an evaporator. In the following specification I disclose a process by which I produce new and useful results, and in which I utilize such an evaporator in connection with other structures which will hereinafter be more fully described.

In the refining of petroleum oils, and particularly in the refining of asphalt base oils to produce asphalt, and the like, it is often necessary to subject the oils to extremely high temperatures. These high temperatures are injurious to the lighter contents of the oil and it is highly desirable to remove the vapors having a moderatevboiling point before subjecting the oils to high temperatures. The principal object of' the invention isto provide means for so removing a .certain proportion of the oil by moderate heating before subjecting it to higher heats.

The secondary vapors given off by the higher temperature or secondary distillation must be condensed, and al further object of my invention is to use the latent heat of these secondary vapors in whole or in part for my primary distillation, thereby simplifying not only the problem of condensing the secondary vapors, but also the problem of supplying the heat necessary for the primary distillation.

In my invention I use a primary and a Secondary evaporating means. The oil at any desired temperature is passed into the primary evaporator which is maintained at a moderate temperature by means to be eX- plained, and certain primaryV vapors are taken therefrom. The primary residuum from the primary evaporator is then further heated and passed into the secondary evaporator, which is preferably externally Specification of Letters Patent.

Patented Dec. 11, 191?.

heated. 4The secondary vapors, due to the distillation taking place inthe secondary evaporator, are then utilized to heat the primary evaporator preferably by means which will be describe Further objects Iand advantages will be made evident hereinafter, or will be evident to one skilled iny the arts to which the invention'pertain's', after reading the annexed speciicatio'nj and inspecting the annexed drawings.

The drawings and specifications illustrate and describe one embodiment of my invention and the doctrine of equivalents should be broadly applied in construing the claims.

In the drawings,

Figure 1 is a plan view, largely diagrammatic, of a portion of the apparatus used in my process.v

Fig. 2 is a partial elevation on the line 2-2 of Fig. 1, certain of the parts being shown in section to better illustrate the invention.

Fig. 3 is a sectional plan view of the apparatus taken on the plane :r3- m3 of Fi 2.

The apparatus broadly considere consists of a primary evaporator 11, a secondary evaporator 12, a furnace 13, an oil pump 14, a primary condenser 15, and a secondary condenser 16. The furnace 13, the oil pump 14 Fig. 1, and the condensers 15 and 16 may have any convenient form, the form shown being merely illustrative.

The primary evaporator 11 and the secondary evaporator 12 may be formed as shown in Fig. 2. The primary evaporator consists of a wall 17 which may be formed of sections, as shown, or which may be in the form of a continuous plate. A top 18 and a bottom 19 form with the wall 17 a primary evaporating chamber 20. Hot oil is conducted into the top of this chamber by means of a hot oil pipe 21, and the primary residuum is conducted from this chamber by means of a primary residuum pipe 22. A vapor column 23 iscentrally'located in the primary evaporating chamber 20 extending upwardly therethrough and being provided with a series of deiecting cones 2li-and a perforated distributingcone 25. A primary vapor outlet 26 is in open communication with the vapor column 23 and extends through the side wall 17 of the evaporator. The wall 17 is surrounded by a, shell 27 which is tightly secured to the wall l? at the points 28 and 29, the primary7 vapor outlet passing through the shell 27 and being tightly secured therein. A vapor and liquid outlet 30 is provided :tor conducting the condensed liquid and vapor from the interior oit the heatin compartment 3l formed between the shell 2 and the walll?. Vapor take-ortis 32 connect with the interior oic the heating compartment 31. The evaporator l2 consists ont an outer wall 35 having a top 36 and a bottom 37, the parts 35, 36, and 3i? forming a secondary evaporating chamber 38. Located in the chamber is a secondary vapor column 39 which has secured thereon secondary deHecting cones 40 and a secondary perforated distributing cone dl. Heated residuum is admitted through the top 36 by means of the heated primary residuum pipe 4:2, and secondary residuum is removed from the bottom 37 by'means of a secondary residuum pipe 4:3. A man hole is provided at 44 to give access to the bottom of the secondary evaporating chamber 38, 'lhe vapor column 23 is perforated at d5 to allow the vapors from the primary eva orating chamber 20 to pass 'freely into t e primary vapor column 23, and the secondary vapor column 39 is similarly perforated at 46 to allow the vapors from the secondary evaporating chamber 38 to pass 'freely into the secondary vapor column 39. The vapor take-offs 32 are in open communication with the interior oi the secondary vapor column 39 connecting it with the heating compartment 31 of the primary. The condensers 15 and 16 are provided with water pipes i7 by which they may be cooled. The furnace 13 consists preferably ot an outer shell 4:8 in which any suitable heating means is installed and in which there are a series or? retorts 49 which are fed with primary residuum through the pipe 50 by the pump le, the heated primary residuum passing from the retorts 49 through the pipe l2 into the top of the secondary evaporating chamber 38.

rlhe method oi operation of the invention is as follows:

@il which may have been heated by absorption from the outdowing secondary residuum or vapors, or in a furnace, not shown, but similar in construction to the furnace 13, is passed through the hot oil pipe 21 into the top oi the primary evaporating chamber 26, falling upon the distributing cone 28 and passin through the holes therein onto the rst o' the deilecting cones 2d, being thrown from the edge of this cone onto the interior surface ot the wall 17, and passing downwardly thereover in a thin stream, anyoil which leaves this wall being returned thereto by the lower dedecting cones 24,-. 'llhe oil passing in a thin stream or iilm absorbs heat from the secondary vapors in the heating comparlrrnent 3l, the primary vapore aandoen being released trom this thin hlm and ililling the interior or the primary evaporating chamber 20. 'lhese vapors pass through the openings d5 into the interior oit the primary vapor column 23 and outwardly through the primary vapor column 26 into theprlmary condenser 15 where they are condensed, passing out as a primary distillate through a primary distillate pipe 5l. The residuum `from the primary evaporation taking place in the primary evaporating chamber 20 passes outwardly through the primary residuum pipe 22 to the pump 1d, this pump forcing the primary residuum through the pipe 50 into the retorts i9 which are heated by the furnace d8, the heated primary residuum passing upwardly through the pipe l2 and into the secondary evaporating chamber 38. 'lhe heated primary residuum from the pipe l2 falls upon the secondary distributing cone 41, passing through the pertorations therein onto the rst oi the secondary deflecting cones 40 and being forced from the edge of the rst of the delecting cones 40 onto the inner surface oit the wall 35, passing downwardly over this inner'surtace in a thin iilm, any oil which is deflected therefrom being returned to the inner suriace of the wall 35 by the lower secondary deiiecting cones 4&0. The heated gases from the furnace 13 passing upwardly through the stack 33 heat the wall 35 and cause an evaporation to take place yfrom the thin hlm oitu oil passing downwardly over the inner surface thereoi'r. The secondary 'Vapors released from this thin iilm lill the secondary evaporating chamber 38 and pass through the openings d6 into the interior olf' the secondary vapor column 39. These vapors pass outwardly through a wall 35 and through a stack 33, through the secondaryI vapor take-offs 32 into the heating compartment 3l, and thence through the vapor and liquid pipe 30 into the condenser 16 where they are cooled into a secondary distillate which may be taken olii through a secondary distillate pipe 52. lt will be noted that the secondary vapors are lowered in temperature in passin through the heating compartment 31, giving up their latent heat ot evaporation to the wall 17, which in turn gives up the heat units to the thin nlm of oiliowing over the inner surface thereof, theheat units being absorbed by the primary vapors as latent heat orn evaporation. This arrangement produces a very great iuel economy.

By trst raising the oil to be treated to a moderate heat in the primary evaporator, and taking oh1 the lighter vapors before attempting to raise the oil to its hnal temperature in the furnace 13, all danger ont craching or changing the molecular structure oit the lighter vapors, which maire up the primary distillate, is avoided, and these vapors lit are taken oii3 in their natural condition. The amount of heat applied to the oil entering through the pipe 21 depends on the kind of oil that is being refined, and in the case of some light oils such primary heating may be dispensed with, the oil entering through the pipe 21 being in its natu-ral state. The various temperatures may be so controlled that the secondary residuum is an asphalt, or this secondary residuum may be still further treated to produce an asphalt.

I claim as my invention:

1. In an oil refining apparatus, a primary evaporator, means for taking off primary vapors from said primary evaporator, means for taking oif and heating the primary residuum from said primary evaporator, a secondary evaporator, means for passing said primary residuum into said secondary evaporator, means for taking off secondary residuum from said secondary evaporator, means for taking ofi' secondary vapors from said seconda-ry evaporator, and means for utilizing said secondary vapors as a heating means in said primary evaporator.

2. In an oil refining apparatus, a primary evaporator, means for taking off primary vapors from said primary evaporator, means for taking ofi and heating the primary residuum from said primary evaporator, a secondary evaporator, means for passing said primary residuum into said secondary evaporator, means for taking ofi secondary residuum from said secondary evaporator, means for taking ofi' secondary vapors from said secondary evaporator, Walls forming a heating compartment in said primary evaporator, and means for passing said secondary vapors into said heating compartment.

3. The process of refining oils which consists in raising an oil to a moderate temperature, releasing the primary vapors therefrom, raising the residuum to a higher temperature, releasing secondary vapors thereuum into said secondary evaporator, means for taking off secondary residuum from said secondary evaporator, means for taking off secondary vapors from said secondary evaporator, and means for utilizing said secondary vapors as a heating means in said primary evaporator.

5. In an oil refining apparatus, a furnace,

a stack through which the products of combustion from said furnace are passed, a primary evaporator, means for taking off primary vapors from said primary evaporator, means for taking off and heating the primary residuum from said primary evaporator, a secondary evaporator located in said stack, means for passing said primary residuum into said secondary evaporator, means for taking ofi secondary residuum from said secondary evaporator, means for taking ofi' secondary vapors from said secondary evaporator, Walls forming a heating compartment in said primary evaporator, and means for passing said secondary vapors into said heating compartment.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 28th day of November, 1914. 4

MILON J. TRUMBLE.

In presence of- A. J. GUTZLER, FRED A. MANSFIELD. 

